Drags, Sliders, Inputs: Reactivated decimal point replacement for SliderScalar and DragScalar. (#7389, #6719, #2278)

Amend/fix 4a242644

Visible in demo->basic->listbox

Internals: adding ImGuiNavMoveFlags_NoClearActiveId even though there's currently no satisfying way to take advantage of it. (#1418)

Child Windows: adjust resizing limits to match window padding rather than inner clipping rectangle. (#7440)

Child windows: look at the parent window's flags to decide whether to clamp child resizes. (#7440, #1710)

Tables: Angled headers: fixed borders not moving back up after TableAngleHeadersRow stops being called. (#7416)

# Conflicts:
#	imgui.cpp

ImDrawList: (Breaking) merge float radius_x/radius_y parameters into ImVec2 radius in PathEllipticalArcTo(), AddEllipse(), AddEllipseFilled(). (#2743, #7417)

This reverts commit 9d9ca37a.

Inputs: (Breaking) More formally obsoleted GetKeyIndex() when IMGUI_DISABLE_OBSOLETE_FUNCTIONS is set. (#4921)

Added by f08566b4

- Simplify and compact some code. Shallow tweaks.
- Add comments.
- Add concave shape demo.
- Remove coarse culling.
- Remove nested types to match coding style and for consistent type nams when translated to other languages.
- Merged ClassifyNode() and ReclassifyNode().
- Extracted ImTriangleIsClockwise().
- Hold copy of points inside nodes instead of pointing to them.

Extracted from 2023/12/29 post.
WIP add PathFillConcave(), AddConcavePolyFilled()
* remove use of 'auto'
* IsConvex -> ImPathIsConvex
* Triangulator -> ImTriangulator
* ImTriangulator: split declaration from definition, ImTriangulator can be put in the header if necessary
* ImTriangulator: Add node list flip to reverse winding order and handle degenerate cases
* ImTriangulator: Remove _HeapStorage, always require scratch buffer to be provided
* ImTriangulator: Use ImTriangleContainsPoint
* AddConcavePolyFilled: Clone AddConvexPolyFilled and use triangulator
* AddConcavePolyFilled: Remove ImDrawListEx_AddPolyFilled_xxx
* AddConcavePolyFilled: Use _Data->TempBuffer in triangulator
* AddConcavePolyFilled:

Windows: Scrollbar visibility decision uses current size when both size and contents size are submitted by API. (#7252)

Backends: Win32: made it so that an appearing viewport showing up doesn't bring its parent viewport to front. (#7354)